Removal of colour cast or luminosity shift is often necessary, especially when a photo underwent a few steps of editing, and had a few filters, levels, curves, or other changed applied to it. Whether you stack photoshop effects or adding textures to your photo, at some point you will run into an issue that the photo becomes too saturated or too bright, has too much contrast, etc. That is when the technique shown in this photoshop video tutorial comes in handy. It is an easy trick that can be applied to any photo, at any stage between two layers in photoshop, via layer blend modes.